Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
hieu tinh » chieu tinh, lieu tinh, hieu binh
kieu tinh » lieu tinh, trieu tinh, diep tinh
trang cua » tranh cua, tang cua, trung cua
dung cong » dung trong
cong vang » cong lang, cong quang, cong ngang
vang tuan » van tuan, vong tuan, quang tuan
tuan cu » tuan tu, quan cua, tuan thu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu tinh) OR (kieu tinh)) - hanh ((trang cua) or (trung tuan)) dung cong vang tuan cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu tinh) OR (kieu tinh)) - hanh ((trang cua) OR (trung tuan)) dung cong vang tuan cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu tinh) OR (kieu tinh)) - hanh ((trang cua) or (trung tuan)) dung cong vang tuan cu".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu tinh) OR (kieu tinh)) - hanh ((trang cua) or (trung tuan)) dung cong vang tuan cu*.